adding brdf, but virtual is probably terrible for performance

src/util/Ray.h

@@ -1,8 +1,24 @@
 #pragma once
 #include <glm/glm.hpp>
 
+struct Payload
+{
+  glm::vec3 accumulatedRadiance = glm::vec3(0);
+  glm::vec3 accumulatedMaterial = glm::vec3(0);
+};
+
 struct Ray
 {
     glm::vec3 origin;
     glm::vec3 direction;
+    uint32_t depth = 0;
+    Payload payload;
+};
+
+struct HitInfo
+{
+  float t;
+  glm::vec3 position;
+  glm::vec3 normal;
+  glm::vec2 texCoords;
 };